Adjustable screw spanner



Feb. 27, 1923.

w F APPINGER ET AL ADJUSTABLE SCREW SPANNER' Filed June 26,-

Patented Feb. 27, 1923.

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ADJUSTABLE sonnw srnnnnn.

- Application filed xuneee, 1920. Serial No. 392,071.

Gasman man TEE rnovisions at THE senor Mason 3; 1521,11 srAr.,I..,' 1313.

To all whom it may concern:

Be it" known that FRIEDRICH Arrrnenn and Penn Baonrrornn, citizens of the eel-'- man Republic, residing at Nuremberg, Germany,have invented certain new and useful Improvements in Adjustable crew Spanners (for which I have filed application in Germany 29 June, 1918; Sweden 6, 8, 1919; Switzerland 20, 10 1919; France 2, 2, 1920; England 2 2, 1920; Italy 1%, 2, 1920), of which the following is a specification.

The adjustable screw-spanners with j awsupport of known construction (such as for example described in S. A; Patent 4852021) are constructed so that the main spindle of the outer jaw is adapted to be adjusted by means of inner threadings, the support of the outer jaw being simultaneously adjusted through an outer threading of a nut (or nutspindle) the said nut being located in an aperture of the body of the inner jaw so that its faces project at both sides to be gripped with the fingers. Spanners of this type possess the following inconveniences 1. The jaws cannot be pressed together with sufficient strength as the nutspindle has to be turned through the frictional pressure of two or three fingers only;

2. The nutspindle must not be greased as otherwise the fingers would slide off, the ungreased spindle getting however rusty if it is handled with moist hands so that it gets jammed in the toothed part of the sup-- port of the outer jaw;

3. Dust, filings or other foreign bodies adapted to exert a grinding or frictional effect can easily get through the open aperture between the nutspindle and the threads of the outer support which work together wherefrom results that in the beginning the parts become jammed and that finally they are ground out which leads to back lash;

4. When the spanner is dropped upon iron parts it easily happens that the laterally projecting threaded parts of the nutspindle are damaged so that the threads of the spindle no longer turn easily in the female thread of the outer support and the spanner becomes useless;

5. The mounting of the nutspindle by means of its two faces which are situated comparatively close together'is not very secure,- so that the nutspindle does not form a secure guiding forthe main spindle, the

latter being, so to say, guided only by its smooth front part but not by its threaded part. g I According to this invention all thesefin conveniences are avoidedby makingfthe nutspindle in one part' with the spanner shaft which is-in the we'llkno-wn man iier adapted to herotated ;in the body of the inner jaw said nutspindle being en closed in thesaid'body of the inner jaw and secured against lateral play bybei'ng guded in said body at its upper'andflowei en S. v V.- i," 7

In the accompanying drawings the invention is shown by way of example:

Fig.1 shows the improved spanner in a longitudinal section.

Fig. 2 is a section on line AB and Fig. 3 is a section on line C-D of Fig. 1.

The outer 1 has-in the well known manner-a spindle 2 and a support 3. The support 3 is fixed to the outer jaw 1 by a pin a. Two parallel borings 6 and 7 separated by a bridge 8 serve for receiving the part of the shaft which carries the nutspindle and the support 3 respectively. The simultaneous adjustment of the spindle 2 through the. inner thread and of the support 3 by means of its toothed part 11 through the outer thread 10 in consequence. of the rotation of the nutspindle is also known.

According to the invention the nutspindle is made in one piece with the handle 9 of the spanner located in the body 5 of the inner jaw and secured against lateral play through being guided in said body at the upper end by the ring-shaped extension 14- and at the lower end by the ring-shaped thickening 15. The nutspindle is secured against play in longitudinal directionby screws 13 engaging in a circular groove of a ring 12 inserted in the thickening 15.

The spanner of'this improved construction presents the following advantages in comparison with the spanner of known construction hereinbefore described.

1. Its jaws can be strongly preswd together, as the rotation of the nutspindle is not directly effected through a pressure of the fingers upon the nutspindle, but by gripping the handle with the hand,

2. The nutspindle can always be greased and consequently be easily'rotated.

3. No foreign bodies can get between the outer thread-1O of the nutspindle and the teeth 11 of the outer support 3, so that no back lash will happen even it the spanner has been used for a long time.

ports[transversely and without play the threaded part of the mainspindle, no jam ming of the outer jaw can happen, any displacement of the inner jaw 5 in longitudinal direction with regard to the shaft 9 be i g effectively prevented by screws 18 engaging in a circular groove of a ring 12.

The-improved spanner works accurately and easily; it is simple to manipulate and very clean, and it is of great durability with moderate cost of manufacture.

We claim:

An adjustable spanner comprising a spinintense support of the outer aw, a nut shaft. made in one piece with the said nutspindle and a, ring-shaped extension at, the upper end of the said nutspindle, and a ring-shaped thickening at the lower end of said nut spindle for securing the said nutspindle' against lateral play substantially as described and shown" and for the purpose set forth.

In testimony whereof they aifix their signatures in presence of two witnesses.

FRIEDRICH APPINGER. PAUL BACHHUFER;

Witnesses:

Norm: Mt'iLLnn, RUST PLATHo. 

